public IEnumerable <IEvent> HandleCreateCourse(CreateCourse command)
{
// Validate the command.
if (State != null)
{
return(new IEvent[] { new Failed("Can't create an existing course.") });
}
if (command == null)
{
return(new IEvent[] { new Failed("Can handle a null command.") });
}
var validationResult = CourseValidator.Validate(command);
if (!validationResult.IsValid)
{
return(new IEvent[] { new Failed(GetFormattedErrorMessage(validationResult)) });
}
return(new IEvent[] { new CourseCreated(command) });
}
public IEnumerable <IEvent> HandleUpdateCourse(UpdateCourse command)
{
// Validate the command.
if (State == null)
{
return(new IEvent[] { new Failed("Course doesn't exist.") });
}
if (Deleted)
{
return(new IEvent[] { new Failed("The course was previously deleted.") });
}
var validationResult = CourseValidator.Validate(command);
if (!validationResult.IsValid)
{
return(new IEvent[] { new Failed(GetFormattedErrorMessage(validationResult)) });
}
// Validate that the command doesn't conflict with the current state.
if (command.Id != State.Id)
{
validationResult.Errors.Add(new ValidationFailure("Id", "Id mismatch."));
}
if (command.Holes.Length != State.Holes.Length)
{
validationResult.Errors.Add(new ValidationFailure("Holes", "Cannot change the number of holes."));
}
if (command.PlayerId != State.PlayerId)
{
validationResult.Errors.Add(new ValidationFailure("PlayerId", "Cannot change a course's player."));
}
if (!validationResult.IsValid)
{
return(new IEvent[] { new Failed(GetFormattedErrorMessage(validationResult)) });
}
return(new IEvent[] { new CourseUpdated(command) });
}